Lamp



FIG. 1 is a front view of my new design relating to a lamp;

FIG. 2 is a top plan view thereof, the bottom plan view being the mirror image of the top plan view;

FIG. 3 is a rear view thereof; and,

FIG. 4 is a right side view, the opposite side view being the same. 

The ornamental design for a lamp, substantially as shown and described. 